CVE-2026-2603
Keycloak: keycloak: unauthorized authentication via disabled saml identity provider
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
A flaw was found in Keycloak. A remote attacker could bypass security controls by sending a valid SAML response from an external Identity Provider (IdP) to the Keycloak SAML endpoint for IdP-initiated broker logins. This allows the attacker to complete broker logins even when the SAML Identity Provider is disabled, leading to unauthorized authentication.
| CWE | CWE-306 |
| Vendor | red hat |
| Product | red hat build of keycloak 26.2 |
| Published | Mar 18, 2026 |
| Last Updated | Mar 18, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
Red Hat / Red Hat build of Keycloak 26.2
All versions affected Red Hat / Red Hat build of Keycloak 26.2
All versions affected Red Hat / Red Hat build of Keycloak 26.2
All versions affected Red Hat / Red Hat build of Keycloak 26.2.14
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4.10
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:3925 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:3926 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:3947 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:3948 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-2603 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2440300
Credits
Red Hat would like to thank Joy Gilbert and Reynaldo Immanuel for reporting this issue.